Saturation characteristics of gain guiding in index-antiguided waveguides

Tsing-Hua Her; Xianyu Ao; Lee W. Casperson

doi:10.1117/12.841492

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17 February 2010 Saturation characteristics of gain guiding in index-antiguided waveguides

Tsing-Hua Her; Xianyu Ao; Lee W. Casperson

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Proceedings Volume 7579, Laser Resonators and Beam Control XII; 757907 (2010) https://doi.org/10.1117/12.841492
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

We investigate numerically and analytically the effects of gain saturation on the propagation of the fundamental mode in a gain-guided index-antiguided slab waveguide. The propagating mode adapts to gain saturation by becoming less confined, while at the same time its peak intensity increases more slowly. The modal gain coefficient is shown to scale linearly with the modal confinement in the cladding. At steady state, both the mode shape and power remain constant. We show that, at large index antiguiding, the field profile inside the core remains nearly constant during propagation, which allows an analytical description of the evolution of the optical power inside the core.

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Tsing-Hua Her, Xianyu Ao, and Lee W. Casperson "Saturation characteristics of gain guiding in index-antiguided waveguides", Proc. SPIE 7579, Laser Resonators and Beam Control XII, 757907 (17 February 2010); https://doi.org/10.1117/12.841492

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